The 1999 NSX is Honda's mid-engine exotic with bulletproof mechanicals but aging rubber, cooling system vulnerabilities, and expensive specialist labor. Most failures stem from deferred maintenance rather than inherent design flaws.
Transmission Oil Cooler Line Failure
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: ATX fluid leaking under car center section, transmission overheating warnings, burnt ATX fluid smell, red fluid pooling after parking
Fix: Replace rubber cooler lines and hard lines if corroded; often bundled with transmission mount replacement since you're under there. 4-6 hours labor due to mid-engine access challenges.
Estimated cost: $800-1,500
Transmission Mount Deterioration
Common · medium severityTypical onset: 70,000-100,000 mi
Symptoms: clunking on acceleration or deceleration, excessive drivetrain movement felt through shifter, vibration at idle in gear, visible cracking or separation of rubber isolators
Fix: Replace transmission mount assembly; access requires lowering exhaust and working around mid-engine packaging. 3-4 hours labor, OEM parts strongly recommended over aftermarket.
Estimated cost: $600-1,000
Fuel System Clogging and Filter Neglect
Occasional · medium severitySymptoms: rough idle or stumbling under load, fuel pressure drop, hesitation at high RPM, check engine light with lean codes
Fix: In-tank fuel filter and fuel pump strainer often ignored; requires tank drop. If untreated, debris damages injectors. Tank drop service is 5-7 hours due to rear-mid placement and exhaust routing.
Estimated cost: $900-1,800
Snap Ring Transmission Failure (Early VINs)
Rare · high severityTypical onset: varies widely
Symptoms: sudden loss of gears, grinding or clunking from trans, inability to engage any gear, metal shavings in ATX fluid
Fix: Specific to early 1991-1992 manual trans with VINs in snap-ring range, but some '99s have transplanted older transmissions. Requires full trans removal and internal rebuild. 12-16 hours labor plus rebuild costs.
Estimated cost: $3,500-6,000
Cooling System Hose and Radiator Aging
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: coolant smell in cabin, coolant weeping from hose connections, overheating in traffic, low coolant warnings, visible hose cracking
Fix: Multiple rubber hoses, radiator end tanks, and water pump can fail simultaneously on neglected cars. Full cooling system refresh is 6-8 hours due to engine bay access; overheating risks head gasket failure.
Estimated cost: $1,500-3,000
Window Regulator Mechanism Failure
Occasional · low severityTypical onset: 90,000+ mi
Symptoms: slow or binding window operation, window drops into door, clicking noises during window operation, window won't stay up
Fix: Plastic regulator guides crack; door panel removal and regulator replacement needed. 2-3 hours per side. Common on cars stored in heat.
Estimated cost: $400-700
Engine Rebuild Due to Overheating Damage
Rare · high severitySymptoms: severe overheating event, head gasket failure symptoms (white smoke, coolant loss), loss of compression, oil contamination with coolant
Fix: Usually consequence of ignored cooling system failure. Full teardown, heads resurfaced, new gaskets, bearings inspected. Engine-out service is 25-35 hours; short block replacement if bearings damaged. Not a common failure on maintained cars.
Estimated cost: $8,000-15,000
Buy a well-maintained example with records over a cheaper neglected one — deferred maintenance quickly exceeds purchase price savings on this mid-engine platform.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.